Analog Devices ADSP-21364 Benutzerhandbuch

ADSP-21364 EZ-KIT Lite Evaluation System Manual

1-11 

The LEDs connect to the parallel port pins, 

AD7–0

, via a latch. The parallel 

port of the processor can be set up as a memory bus or as general-purpose 

FLAG

 pins. The latch allows the LEDs to be written to in both cases. Infor-

mation about setting up the latch can be found in 

.

When the LEDs are accessed as 

FLAG

 pins, the latch must be set up to pass 

the data through to pins 

AD7–0

 of the processor. In this mode, it is also 

necessary to set up the parallel port to be 

FLAG

 pins. To set up the parallel 

port as 

FLAG

 pins, set the 

PPFLGS

 bit in the 

SYSCTL

 register. 

 summarizes the LED and 

FLAG

 connections. 

L

An example program is included in the EZ-KIT Lite installation 
directory to demonstrate the functionality of the LEDs and push 
buttons. 

Table 1-3. LED Connections

LED1

AD0

FLAG8

LED2

AD1

FLAG9

LED3

AD2

FLAG10

LED4

AD3

FLAG11

LED5

AD4

FLAG12

LED6

AD5

FLAG13

LED7

AD6

FLAG14

LED8

AD7

FLAG15